# Nginx configuration for MCP IMAP Agent
# Place in: /etc/nginx/sites-available/mcp-imap
# Enable with: ln -s /etc/nginx/sites-available/mcp-imap /etc/nginx/sites-enabled/
# Get SSL cert: certbot --nginx -d imap.maxtheweb.ai

upstream mcp_backend {
    server 127.0.0.1:8000;
    keepalive 32;
}

server {
    listen 80;
    server_name imap.maxtheweb.ai;

    # Redirect HTTP to HTTPS
    return 301 https://$server_name$request_uri;
}

server {
    listen 443 ssl http2;
    server_name imap.maxtheweb.ai;

    # SSL certificates (certbot will populate these)
    ssl_certificate /etc/letsencrypt/live/imap.maxtheweb.ai/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/imap.maxtheweb.ai/privkey.pem;

    # SSL configuration (Mozilla Intermediate)
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

    # Security headers
    add_header X-Frame-Options "DENY" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

    # Logging
    access_log /var/log/nginx/mcp-imap-access.log;
    error_log /var/log/nginx/mcp-imap-error.log;

    # MCP SSE endpoint for N8N (streaming)
    location /mcp/sse {
        proxy_pass http://mcp_backend;

        # Proxy headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # SSE support (critical for MCP protocol)
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 86400s;
        proxy_send_timeout 86400s;

        # Chunked transfer encoding for streaming
        chunked_transfer_encoding on;

        # Rate limiting
        limit_req zone=api_limit burst=10 nodelay;
    }

    # MCP messages endpoint for N8N (posting)
    location /mcp/messages {
        proxy_pass http://mcp_backend;

        # Proxy headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # Standard HTTP
        proxy_http_version 1.1;

        # Rate limiting
        limit_req zone=api_limit burst=10 nodelay;
    }

    # Health check endpoint (no auth required)
    location /health {
        proxy_pass http://mcp_backend;
        access_log off;
    }
}

# Rate limiting zone (10 req/sec per IP)
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;